I think its good for the couple of basic points it covers. There is a lot more stuff that you really want to get into but yes a good overview for someone starting out. To really get down to the full and complete understanding of how to set a car tune-up would take quite a few pages.
Yes about setting the dwell. Dwell is way more important than the gap. The point gap is to ballpark your dwell setting to get the car running then you always want to set dwell.